1.2.1.11 aspartate-semialdehyde dehydrogenase grixazone biosynthesis 1.10.3.15 grixazone synthase grixazone biosynthesis 2.7.2.4 aspartate kinase grixazone biosynthesis 4.1.2.56 2-amino-4,5-dihydroxy-6-oxo-7-(phosphooxy)heptanoate synthase grixazone biosynthesis 4.1.99.20 3-amino-4-hydroxybenzoate synthase grixazone biosynthesis